Highest temperature in Hong Kong on July 20?

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Market context

Hong Kong will record its highest temperature for 20 July 2026, with the Hong Kong Observatory set to publish the absolute daily maximum in degrees Celsius once the Daily Extract is finalized. The market resolves to the specific temperature range containing this figure, settling in USDC on-chain with a deadline of 12:00 UTC on 20 July 2026. Current crowd-implied probability sits at 0% YES, suggesting traders expect the peak heat to fall outside the offered range, though seasonal forecasts indicate July–September 2026 temperatures are likely normal to above-normal due to prevailing ENSO conditions[1].

Historically, Hong Kong’s July highs often exceed 33°C, with record daily maxima in recent years reaching 36.1°C during intense heatwaves. Given the above-normal temperature outlook for this quarter, a reading below 30°C would be anomalous, while anything above 35°C aligns with typical summer extremes under current climate models[1]. The 0% probability implies the market’s range is either too low to capture expected highs or misaligned with the Observatory’s historical July data, where temperatures frequently breach 34°C.

Traders should monitor the Observatory’s Daily Extract release, which finalizes the “Absolute Daily Max (deg. C)” for 20 July, as settlement depends entirely on this published figure. No external crypto catalysts like BTC funding rates or whale flows directly influence this weather contract, but on-chain liquidity and USDC settlement mechanics may affect trading volume as the window closes. The key dependency remains the official data publication, with no interim announcements expected before the 2026-07-20T12:00:00Z settlement deadline.

Sources: 1

Methodology

This page reads Highest temperature in Hong Kong on July 20? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

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How does UMA secure the resolution?

The UMA Optimistic Oracle uses a bond system: a proposer posts a bond, a two-hour challenge window opens. On dispute the losing side forfeits the bond — financial incentive for honest resolution.

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